Koh Samui weather in July 2025

Expect daytime maximum temperatures of 31°C in Koh Samui, Thailand in July and very high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 17 days with some rainfall and typically 146 mm of rainfall in the month.

  • 31°C maximum daytime temperature in July in Koh Samui31
    31°C max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in July in Koh Samui17
    17 days with some rainfall
  • 24°C minimum night-time temperature in July in Koh Samui24
    24°C min night temperature
  • 13 hours of daylight per day in July in Koh Samui13
    13 hours of daylight per day
  • Very high heat & humidity in July in Koh SamuiVH
    Very High heat & humidity
  • 146 mm monthly rainfall in July in Koh Samui146
    146 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in July in Koh Samui11
    11+ (Extreme) UV index
  • 29°C sea temperature in July in Koh Samui29
    29°C sea temperature

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The July weather guide for Thailand (Koh Samui) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Koh Samui in July?

Daytime temperatures usually reach 31°C in Koh Samui in July with very high heat and humidity, falling to 24°C at night.

How sunny is it in Koh Samui in July?

There are normally 6 hours of bright sunshine each day in Koh Samui in July - that's 48% of daylight hours.

How warm is the sea around Koh Samui in July?

The average sea temperature around Koh Samui in July is 29°C.

Does it rain in Koh Samui in July?

There are usually 17 days with some rain in Koh Samui in July and the average monthly rainfall is 146mm.

Koh Samui July sunrise & sunset times

Browse the sunrise and sunset times for Koh Samui in July 2025. Select a month to view Koh Samui sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st July 2025 06:03 18:44
Wednesday, 16th July 2025 06:07 18:45
Thursday, 31st July 2025 06:10 18:42

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